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Provides user interface objects built according to the cross-platform
Nimbus look and feel.

<p>Nimbus uses instances of the {@link javax.swing.Painter} interface to paint
components. With each Swing component it associates a foreground and a
background {@code Painter}, and there may be several painters for different
component states.

<p>Nimbus allows customizing many of its properties, including painters, by
altering the {@link javax.swing.UIDefaults} table. Here's an example:
<pre>
    UIManager.put("ProgressBar.tileWidth", myTileWidth);
    UIManager.put("ProgressBar[Enabled].backgroundPainter", myBgPainter);
    UIManager.put("ProgressBar[Enabled].foregroundPainter", myFgPainter);
</pre>

<p>Per-component customization is also possible. When rendering a component,
Nimbus checks its client property named "Nimbus.Overrides". The value of this
property should be an instance of {@code UIDefaults}. Settings from that table
override the UIManager settings, but for that particular component instance
only. An optional client property, "Nimbus.Overrides.InheritDefaults" of type
Boolean, specifies whether the overriding settings should be merged with
default ones ({@code true}), or replace them ({@code false}). By default they
are merged:
<pre>
    JProgressBar bar = new JProgressBar();
    UIDefaults overrides = new UIDefaults();
    overrides.put("ProgressBar.cycleTime", 330);
    ...
    bar.putClientProperty("Nimbus.Overrides", overrides);
    bar.putClientProperty("Nimbus.Overrides.InheritDefaults", false);
</pre>

<p>Colors in Nimbus are derived from a core set of
<a href="doc-files/properties.html#primaryColors">primary colors</a>. There are also
<a href="doc-files/properties.html#secondaryColors">secondary colors</a>, which are
derived from primary ones, but serve themselves as base colors for other
derived colors. The derivation mechanism allows for runtime customization,
i.e. if a primary or secondary color is changed, all colors that are derived
from it are automatically updated. The method
{@link javax.swing.plaf.nimbus.NimbusLookAndFeel#getDerivedColor(java.lang.String, float, float, float, int, boolean)}
may be used to create a derived color.

<p>These classes are designed to be used while the
corresponding <code>LookAndFeel</code> class has been
installed
(<code>UIManager.setLookAndFeel(new <i>XXX</i>LookAndFeel())</code>).
Using them while a different <code>LookAndFeel</code> is installed
may produce unexpected results, including exceptions.
Additionally, changing the <code>LookAndFeel</code>
maintained by the <code>UIManager</code> without updating the
corresponding <code>ComponentUI</code> of any
<code>JComponent</code>s may also produce unexpected results,
such as the wrong colors showing up, and is generally not
encouraged.

<p><strong>Note:</strong>
Most of the Swing API is <em>not</em> thread safe.
For details, see
<a href="http://java.sun.com/docs/books/tutorial/uiswing/concurrency/index.html"
   target="_top">Concurrency in Swing</a>,
a section in
<em><a href="http://java.sun.com/docs/books/tutorial/"
       target="_top">The Java Tutorial</a></em>.

@since 1.7
@serial exclude

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